US3564324A - Gas discharge tube comprising a number of electrodes united to form a group and having the form of characters - Google Patents

Gas discharge tube comprising a number of electrodes united to form a group and having the form of characters Download PDF

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Publication number
US3564324A
US3564324A US776471A US3564324DA US3564324A US 3564324 A US3564324 A US 3564324A US 776471 A US776471 A US 776471A US 3564324D A US3564324D A US 3564324DA US 3564324 A US3564324 A US 3564324A
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United States
Prior art keywords
electrodes
gas discharge
discharge tube
group
strips
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Expired - Lifetime
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US776471A
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English (en)
Inventor
Adrianus Anthonius Ma Hendriks
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US Philips Corp
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US Philips Corp
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Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01JELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J17/00Gas-filled discharge tubes with solid cathode
    • H01J17/38Cold-cathode tubes
    • H01J17/48Cold-cathode tubes with more than one cathode or anode, e.g. sequence-discharge tube, counting tube, dekatron
    • H01J17/49Display panels, e.g. with crossed electrodes, e.g. making use of direct current
    • H01J17/491Display panels, e.g. with crossed electrodes, e.g. making use of direct current with electrodes arranged side by side and substantially in the same plane, e.g. for displaying alphanumeric characters

Definitions

  • the invention relates to a gas discharge tube comprising a number of electrodes united to form a group by stacking, having the form of legible characters and arranged opposite to an anode.
  • a similar gas discharge tube which, according to the invention, comprises a number of uniform electrode groups which are arranged beside each other in a common envelope, the corresponding electrodes of all the groups lying in one plane and the corresponding characters of all the groups being at the same time connected together to form a strip, the electrodes located in different planes being stacked one on the other with the interposition of correspondingly shaped strips of insulating material.
  • Theassembly is inserted in one envelope having an elongated cross section, which envelope may be provided on either end with pinches through which the current supply wires for the various electrodes extend in a vacuum-tight manner.
  • FIG. 1 shows a perspective view of a tube according to the invention
  • FIGS. 2, 3, 4, 5, 6, 7 and 8 show components of the electrode system of the tube
  • FIG. 9 is a partial longitudinal cross'sectional view of a tube according to the invention.
  • FIG. 10 is a longitudinal cross-sectional view of another embodiment.
  • FIG. 11 is a plan view of FIG. 10, partly broken away.
  • reference numeral 1 denotes the glass envelope of the tube which has an elongated cross section and is closed at its end by pinches 2 and 3.
  • the supply conductors for an auxiliary electrode and for the strips to which the character-shaped electrodes are connected extend, for example, through the pinch 2, while the current conductors for the anodes associated with the various groups extend through the pinch 3.
  • the set of electrodes arranged in the envelope 1 is obtained by stacking the components as follows:
  • an insulating strip 4 (FIG. 2) consisting of mica artificial mica or ceramic material, a narrow strip 5 is laid (FIG. 3) which in this case comprises l lugs 6 which are bent at right angles so that the lugs 6 project upwards.
  • an insulating strip 7 is laid (FIG. 4) in which apertures 8 are provided through which the lugs 6 extend.
  • Anode plates 9, in this case II) are secured to the strip 7 in such manner that they are insulated from each other, and are each provided with a current supply wire 13.
  • the anode plates 9 comprise an aperture corresponding to the apertures 8 so that the lugs 6 projects through the anode plates 9 in an insulated manner. In fact, the lugs 6 serve as decimal points.
  • an insulating strip 14 (FIG. is placed in which apertures 15 are provided which correspond to the anodes 9 and are separated from each other by transverse strips 15.
  • the characterlike electrodes are in this case shaped as digits 0-9.
  • Figure 6 shows a strip 16 of the digits, in which the digits 0 are punched in such a manner that said digits are still connected to the strip 16 with narrow strips 17.
  • the strip 16 comprises in this case l0 electrodes 0, which are separated by transverse strips 18.
  • On the strip 16 again a strip 14 is provided on which a strip 16 having digits I is laid, and so on, alternately strips 14 and digit strips 16 with the remaining digits 29.
  • the strips 18 are forced through alternately to one and to the other side.
  • gapshaped spaces are formed between the insulating strips 14 and the digit strips 16 so that metal sputtering from the electrodes cannot cause shortcurcuit between the digit strips 16.
  • a gauze electrode 19 is provided on the uppermost perforated insulating strip 14 and is also provided with a current supply conductor (12 in FIG. 1) and serves to check blackening of the tube by sputtering metal.
  • a mercury holder 20 is secured to the gauze 19 the set thus obtained by stacking strips and digit strips is slid into a glass tube 1 (FIG. 9) having an elongate cross section, after which the tube 1 is heated at the ends and sealed by means of a pinch 2, 3.
  • the tube is provided, for example, on its rear side, with an exhaust tube (not shown). After evacuating and filling with a suitable gas the tube is sealed.
  • the tube shown partly in cross section in FIG. 9 can reproduce a number of IO digits.
  • the lighting up of a digit is obtained by setting up zero potential at the digit strip in question and a positive potential of, for example volts, at the associated anode.
  • a positive potential for example volts
  • the digit strips which do not light up and the gauze 19 are kept at an intermediate potential of, for example, 65 volts. In this case the gauze 19 cannot be connected to the anode 9 as in known digit tubes, since these anodes have to remain independent of each other.
  • FIGS. 10 and 11 show another embodiment in which the anodes 23 are in the form of a U, so that the transverse strips 15 and 18, respectively, of the mica strips 14, and the digit strips 16 may be omitted which simplifies the manufacture and assembling. Since the'digit strips 22 are kept at some distance from each other, by the insulating strips 21, short circuit of the digit strips by metal deposits is avoided as such without forced-through strips as shown in FIG. 7 being necessary. The upright edges of the anodes 23 are kept separated by insulating plates 24.
  • a gas discharge tube comprising an elongated envelope, a plurality of stacks of character-shaped electrodes united to form a group and positioned opposite to an anode, said electrode stacks being arranged beside each other in said envelope with corresponding electrodes of all the groups lying in one plane and the corresponding electrodes of all the groups being at the same time connected together in the form of a strip, the electrodes located in different planes being stacked one on the other with the interposition of correspondingly shaped strips of insulating material.
  • said electrodes light up, and means to apply to the remaining electrodes an intermediate positive potential whereby said latter electrodes do not light up.

Landscapes

  • Gas-Filled Discharge Tubes (AREA)
  • Discharge Lamp (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)
US776471A 1967-12-05 1968-11-18 Gas discharge tube comprising a number of electrodes united to form a group and having the form of characters Expired - Lifetime US3564324A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6716506A NL6716506A (fr) 1967-12-05 1967-12-05

Publications (1)

Publication Number Publication Date
US3564324A true US3564324A (en) 1971-02-16

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ID=19801901

Family Applications (1)

Application Number Title Priority Date Filing Date
US776471A Expired - Lifetime US3564324A (en) 1967-12-05 1968-11-18 Gas discharge tube comprising a number of electrodes united to form a group and having the form of characters

Country Status (9)

Country Link
US (1) US3564324A (fr)
AT (1) AT284974B (fr)
BE (1) BE724856A (fr)
CH (1) CH489112A (fr)
DE (1) DE1809090A1 (fr)
ES (1) ES361029A1 (fr)
FR (1) FR1599121A (fr)
GB (1) GB1182050A (fr)
NL (1) NL6716506A (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3666911A (en) * 1970-01-23 1972-05-30 Sperry Rand Corp Method for manufacturing planar raised cathode gas tubes
DE2107604B2 (de) * 1970-02-19 1978-11-02 Sony Corp., Tokio Anzeigeröhre

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520513A (en) * 1949-04-20 1950-08-29 Sereno Paolo Fluorescent sign lamp
US3361920A (en) * 1965-08-20 1968-01-02 Bell Telephone Labor Inc Combination analog and digital display device
US3418509A (en) * 1965-07-03 1968-12-24 Philips Corp Electrical discharge character indicator tube

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2520513A (en) * 1949-04-20 1950-08-29 Sereno Paolo Fluorescent sign lamp
US3418509A (en) * 1965-07-03 1968-12-24 Philips Corp Electrical discharge character indicator tube
US3361920A (en) * 1965-08-20 1968-01-02 Bell Telephone Labor Inc Combination analog and digital display device

Also Published As

Publication number Publication date
AT284974B (de) 1970-10-12
BE724856A (fr) 1969-06-03
NL6716506A (fr) 1969-06-09
DE1809090A1 (de) 1969-07-24
FR1599121A (fr) 1970-07-15
CH489112A (de) 1970-04-15
GB1182050A (en) 1970-02-25
ES361029A1 (es) 1970-10-16

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